Drill-chuck.



No. 692,988. Patented Feb. l|,A |902.`

A. s. nAvls. DRILL CHUCK. (Appation filed May 20, 1901.)

(No Model) is arranged contracted at both ends.

UNITED STATES PATENT Ormes.

ADELBERT S. DAVIS, OF SENECA FALLS, NEIV YORK, ASSIGNOR TO THE SENECA FALLS MANUFACTURING COMPANY, OF SENECA FALLS, NEV

YORK. 1

SPEGLEEGATION forming part of Letters Patent No. 692,988, dated February 1 1, 1902.

Application filed May 20, 1901- To all?, whom, it ntay concern:

Be it known that I, ADELBERT S. DAVIS, a citizen of the United States,residing at Seneca Falls, in the county of Seneca, in the State of New York, have invented new and useful Improvements in Drill-Chucks, of which the following is a specification.

This invention relates to that class of chucks or tool-holders which are used in drilling and other machines for receiving the shank or tang of the drill or other too] and which are provided with devices which permit the shank to be readily inserted and locked in the chuck and lto be readily released and withdrawn when the tool is to be changed while the machine is in motion.

The object of my invention is to produce a chuck of this kind which is very simple and inexpensive and at the same time efficient and convenient for use.

In the accompanying drawings, Figure lis an elevation, partly in section, ofa chuck provided with my improvements, showing the collet or filling-piece ready to be released. Fig. -2 is a horizontal section in line 2 2, Fig. l. Fig. 3 is a fragmentary vertical section showing the opening in which the locking-ball Fig. 4t is a vertical section of a chuck embodying a plurality of locking devices and showing the collet locked in place. Fig. 5 is a horizontal section in line 5 5, Fig. 4. Fig. 6 is a horizontal section similar to Fig. 5, but showing a modified construction of the grooves in the collet. Fig. 7 is a sectional elevation showing another embodiment of my invention.

Like letters of reference refer to like parts in the several figures. A

A represents the socket-piece of the chuck, having a cylindrical socket a for the reception of the collet, sleeve, or filling-piece B, which is provided with the usual bore b for the reception of the bit or other tool. The socketpiece A is provided with a shank c, by which it is attached to the rotary spindle of the drilling or other machine.

D represents a movable ring or collar which surrounds the cylindrical socket a of the chuck and which is capable of movement on the same in the longitudinal or axial direction thereof. This ring is constructed with a Serial No. 60,982. (No model.)

l plain cylindrical inner face,whichts around the outer cylindrical face of the socket a.

In the construction of the device represented in Figs. 1 and 2 the collet or filling B is provided in its outer cylindrical surface with a horizontal groove e, which extends partly around the collet and in which engages a locking-ball f, arranged in a radial opening g, formed in the wall of the socket a in such a way that this ball can move into the groove e for locking the collet in the socket or out of the groove forA releasing the collet. The vertical cross-section of the groove corresponds with the curvature of the inwardlyprojecting part of the ball. The opening gis shorter than the diameter of the ball, so that when the latter is pressed inwardly, so as to be iiush with the outer surface of the fillingpiece, by pushing the ring down over the ball, as shown in Fig. 2, the ball projects on the inner side of the socket. The ball is prevented from escaping from the inner end of the opening by contracting the opening slightly at the inner end.

The ring D is held on the socket by adevice of any suitable construction which prevents the ring from dropping from the socket and which allows the necessary vertical movement of the ring. A suitable device for this purpose consists of a headless screw h, which projects from the ring into an annular groove z' in the outer surface of the socket. This groove can be made of such height that when the ring is pushed up to its highest position, as shown in Fig. 1, the ring does not entirely clear the opening in which the ball isarranged and prevents the ball from escaping from the outer end of the opening, but allows Jthe ball to move outwardly farenough to Vwithdraw entirely from the groove e in the filling-piece, as shown by dotted lines in Fig.1.

lVhen the filling-piece is to be inserted into the socket, the ring is raised so high as to release the ball. The upward pressure on the the way.V The ring is then `lowered to its locking position and forces the ball inward, when the groove of the filling-piece coincides with the ball.v The ring now holds the ball in its locking position, in which the ball locks the lling-piece in the socket and prevents filling-piece pushes the ball outwardly out of IOO t he latter from being withdrawn. Upon raising the ring, so as to release the ball, the

filling-piece can be readily withdrawn from the socket.

In the construction represented in Figs. l to 6 the groove e in the lling-pieoe does not extend entirely around the filling-piece, but is segmental. The ball upon reaching the end of the groove in rotating with the socket in the direction of the arrow, Figs..5 and 6, compels the filling-piece and the tool secured therein to rotate with the socket, and so-serves not only for locking the lling-piece in the socket, but also for driving the tool.

The ball can be prevented from escaping from the outer end of the opening g by contracting the latter at its outer end also, as shown in Fig. 3.

In the construction shown in Figs. 4 and 5 the filling-piece is provided with three segmental grooves e and the socket with three locking-balls f', instead of the single segmental groove and ball shown in Figs. l and 2.

In the construction shown in Figs. 6 these segmental grooves are formed vin the fillingpieceby providing the latter with an annular groove e2 and breaking the continuity of the groove by pins or plugs c3, secured in the tilling-piece and projecting with their outer portions into this groove.

In the construction represented in Fig. 7 the filling-piece is provided with an annular groove e4 and the socket with a single lockingballfz. In this construction the ball serves only to lock the lling-piece in the socket and not to drive the filling-piece. A separate driving device must therefore be provided for the filling-piece, and this construction is in that respect less desirable than those represented in Figs. l, 2, 4, and 6. For that purpose the filling-piece is provided at its upper end with the usual flattened sides lo and the socket with driving projections Z, preferably formed by screws.

I claim as my invention-` v l. In a chuck,the combination with asocket having an opening which extends through its wall, a filling-piece provided with an external groove in alinement with said opening, a locking-ball arranged in said opening and capatially as described.

ble of moving inward and outward therein, said ball being adapted to project into the groove in the filling-piece when in locking position, and a ring surrounding the socket and capable of movement in the axial direction of the same, said ring having a plaininner face coacting with the ball to force the latterinward to its locking position, substan- 2. In a chuck,the combination with asocket member having an opening which extends through its wall, a filling-piece provided with an external groove in alinement with said opening, and a locking-ball arranged in said opening and capable ot' moving inward and outward therein, said ball projecting into the groove in the filling-piece when in locking position, of a locking ring snugly fitting throughout its width the periphery of the socket member and capable of movement in the axial direction of the same, said ring having a plain inner face by which the ball is forced inward to its locking position, substantially as described.

3. In a chuck',the combination with a socket member having an opening which extends through its wall, a filling-piece provided with an external groove, and a locking device arranged in said opening and capable of moving inward and outward therein, the portion of said device projecting beyond the wall of the socket member having a curved uninterrupted periphery, ot' a locking-ring snugly surrounding said socket member and. capable of movement in the axial direction of the same, said ring having a plain inner face coacting with the portion of the locking device, extending through the wall of the socket member, for forcing the device inward into locking position, and a stop device consisting of an annular groove in the outer side ot' said socket and a projection on the in ner side of said ring entering said groove, substantially as described.

Witness. my hand this 14th day of May,

ADELBERT S. DAVIS. Vitnesses:

CHARLES F. HAMMOND, PAUL B. KENDEY. 

